

A205744


The sequence "u_{nr}" used by Conway and Guy in the construction of A005318 and A096858.


5



0, 0, 1, 1, 2, 4, 4, 7, 13, 24, 24, 44, 84, 161, 309, 309, 594, 1164, 2284, 4484, 8807, 8807, 17305, 34301, 68008, 134852, 267420, 530356, 530356, 1051905, 2095003, 4172701, 8311101, 16554194, 32973536, 65679652, 65679652, 130828948, 261127540, 521203175, 1040311347, 2076449993
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OFFSET

1,5


LINKS

Table of n, a(n) for n=1..42.
R. K. Guy, Sets of integers whose subsets have distinct sums, pp. 141154 of Theory and practice of combinatorics. Ed. A. Rosa, G. Sabidussi and J. Turgeon. Annals of Discrete Mathematics, 12. NorthHolland 1982. See Table 1, column (3).


FORMULA

This is A005318 with the terms A005318(i) repeated iff i is a triangular number.
A005318(n+1) = 2*A005318(n)A205744(n), A205744(n) = A005318(A083920(n)), A083920(n) = n  A002024(n).  N. J. A. Sloane, Feb 11 2012


CROSSREFS

Cf. A005318, A096858.
Sequence in context: A226870 A227751 A268995 * A237859 A240338 A227103
Adjacent sequences: A205741 A205742 A205743 * A205745 A205746 A205747


KEYWORD

nonn


AUTHOR

N. J. A. Sloane, Feb 09 2012


STATUS

approved



